New Holland 4630 turbo, possible injector issue.

Gunrok 02 LB7 · Mar 26, 2012

Hi folks, the tractor in the title is missing on one cylinder. I just replaced the injection pump on it due to a serious leak. I lined up all the timing marks just like they were with the old pump. I have advanced and retarded the injection timing with no curing of the miss. It fires right up on what seems to be the first compression stroke. It takes longer than normal to reach 2k rpm and with the slightest load on the engine it really wants to lay down. My question is, can I remove the injectors without any fluids(coolant or oil) going into the cylinders or are the injectors used to seal off fluid passages? Is there anything special I need to know before I take them out? How hard are the to take apart? I looked at the parts break down and the isn't much to them. And can anyone tell me where to find a service manual, I have looked online at new holland's website and the service manual is the only manual I can't find. I'm about to tow it to the stealership because it's time to cut the brush and it's not running right. Thanks in advance.

RickB · Mar 26, 2012

You can pull the injectors without losing any fluid, It isn't a difficult chore. You probably don't have the tools or talent to rebuild yor own injectors. Try cracking each injector line (one at a time) and see if the engine changes tune. The one that doesn't cause a change in engine sound or speed is the faulty injector. A reman injector should be $150 or less depending on where you buy.

OEM service manuals can be bought here:
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Leave the publication and model blank, then search English, Service manual, NA, and Service manual in the search boxes. The complete manual is $800, but you can buy each volume individually.